the Earth's magnetic field is getting weaker (due to the Sun's weaker field) allowing more cosmic rays to hit the ground

It is not the "magnetic field," it is the magnetic ionization level that is changing in the sun. For example, consider a thermal equivalent. Crank up the heat in your house--what happens? Eventually, all the objects in the room become the same temperature as the air. That is what is happening with the sun--the magnetic "heat" is cranking up, and the planets are responding like objects in the room. (See post on the Earth's Magnetic Field.) The charge on the magnetic field is dissipating--not the static magnetic field, which is getting stronger. (Of course, these concepts of "charged" and "uncharged" are unknown in conventional physics and the electric universe, which does all its analysis under the assumption everything is charged.)

maybe we should start to wear magnetic underwear .....

Or you could try an aluminum foil hat--but just be sure to run a wire to ground, so you get a Faraday cage!